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Posted to issues@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2018/06/06 22:17:00 UTC

[jira] [Commented] (HIVE-19813) SessionState.start don't have to be synchronized

    [ https://issues.apache.org/jira/browse/HIVE-19813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16503983#comment-16503983 ] 

Sergey Shelukhin commented on HIVE-19813:
-----------------------------------------

+1. Could also be atomicboolean?

> SessionState.start don't have to be synchronized
> ------------------------------------------------
>
>                 Key: HIVE-19813
>                 URL: https://issues.apache.org/jira/browse/HIVE-19813
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>            Priority: Major
>         Attachments: HIVE-19813.1.patch
>
>
> This is introduced in HIVE-14690. However, only check-set block needs to be synchronized, not the whole block. The method will start Tez AM, which is a long operation. Make the method synchronized will serialize session start thus slow down hs2.



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